Nessus is a free, up-to-date, and full featured remote security scanner for Linux, BSD, Solaris and some other systems. It is multithreaded, plugin-based, has a nice GTK interface, and currently performs over 910 remote security checks. It has powerful reporting capabilities (HTML, LaTeX, ASCII text) and not only points out problems, but suggests a solution for each of them. Windows version available here.
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Darkstat is an ntop-workalike network statistics gatherer. Built to be faster and smaller than ntop, it uses libpcap to capture network traffic and serves up Web page reports of statistics such as data transferred by host, port, and protocol. It also has a neat bandwidth usage graph.
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Apache v2.0.40 - Apache is the most popular webserver on the Internet, and ranks well in terms of security, functionality, efficiency, and speed. Changelog available here.
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Apache Security Bulletin 20020809 - Cygwin versions of Apache 2.0 contain a serious remote vulnerability which allows remote users to gain information and cause denial of service. Unix is unaffected.
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Lcrzoex is a toolbox for network administrators and network hackers. Lcrzoex contains over 200 functionalities using network library lcrzo. For example, one can use it to sniff, spoof, create clients/servers, create decode and display packets, etc. The Ethernet, IP, UDP, TCP, ICMP, ARP and RARP protocols are supported. Lcrzoex and lcrzo were successfully installed under Linux, FreeBSD and Solaris. This archive contains Lcrzo and Lcrzoex. Windows binaries available here.
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Single Honeypot simulates many services - SMTP, HTTP, shell, and FTP. It can pretend to be many OS's, such as Windows FTP systems, Windows SMTP systems, different Linux distributions, and some Posix distributions.
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MIME Defanger is a flexible MIME e-mail scanner designed to protect Windows clients from viruses and other harmful executables. It works with Sendmail 8.11 / 8.12's "milter" API and will alter or delete various parts of a MIME message according to a flexible configuration file.
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